LI, Ruolin. Linear Algebra and Calculation of the Margin Rate of Product Safety. Frontiers in Business, Economics and Management, [S. l.], v. 7, n. 1, p. 232–234, 2023. DOI: 10.54097/fbem.v7i1.4174. Disponível em: https://drpress.org/ojs/index.php/fbem/article/view/4174. Acesso em: 30 aug. 2026.